<template>
  <div>
    <p>请选择你要购买的书籍</p>
    <ul>
        <li v-for="(ele,i) in arr" :key="i">
            {{ele.name}} <button @click="buyBook(ele)">买书</button>
        </li>
    </ul>
    <table border="1" width="500" cellspacing="0">
      <tr>
        <th>序号</th>
        <th>书名</th>
        <th>单价</th>
        <th>数量</th>
        <th>合计</th>
      </tr>
      <tr v-for="(ele,i) in arr" :key="i">
          <td>{{i+1}}</td>
          <td>{{ele.name}}</td>
          <td>{{ele.price}}</td>
          <td>{{ele.count}}</td>
          <td>{{ele.price*ele.count}}</td>
      </tr>
    </table>
    <p>总价格为: {{totalPrice}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "水浒传",
          price: 107,
          count: 0,
        },
        {
          name: "西游记",
          price: 192,
          count: 0,
        },
        {
          name: "三国演义",
          price: 219,
          count: 0,
        },
        {
          name: "红楼梦",
          price: 178,
          count: 0,
        },
      ],
      totalPrice:0
    };
  },
  methods:{
      buyBook(ele){
        console.log(ele);
        ele.count++
        this.totalPrice+=ele.price
      }
  }
};
</script>